A slim shot is a lipotropic injection containing a blend of amino acids and vitamins designed to support fat metabolism. The most common formula combines methionine, inositol, choline, and vitamin B12, which is why you’ll also see them called MIC shots or skinny shots. They’re offered at med spas, weight loss clinics, and increasingly through telehealth services, typically costing $20 to $75 per injection.
Despite their popularity, slim shots are not FDA-approved for weight loss, and very little clinical research supports the claims made about them. Here’s what’s actually in them, how they’re supposed to work, and what the evidence says.
What’s Inside a Slim Shot
The core ingredients in most slim shots are three lipotropic compounds plus a vitamin:
- Methionine: An essential amino acid that plays a role in breaking down fats in the liver and acts as a building block for other important molecules in the body.
- Inositol: A sugar-like compound involved in fat transport and nerve signaling. It’s sometimes grouped with B vitamins, though it technically isn’t one.
- Choline: A nutrient the liver needs to package and export fat. Without enough choline, fat can accumulate in the liver.
- Vitamin B12: Added primarily for its role in energy production and red blood cell formation.
Some clinics offer enhanced versions with additional B vitamins, carnitine, or other amino acids. The exact formulation varies from provider to provider because there’s no standardized recipe. The FDA doesn’t regulate the quality, purity, or dosages of these supplement injections, so what you get depends entirely on who’s mixing it.
How They’re Supposed to Work
Lipotropic agents promote the flow of fat and bile from the liver, essentially helping the liver process and export fat more efficiently rather than storing it. Methionine, choline, and related compounds produce what researchers describe as a “decongesting” effect on the liver, supporting improved fat metabolism and detoxification. These compounds also increase levels of two key liver substances: one that helps break down fats and another that supports detoxification.
The theory behind slim shots is that delivering these nutrients by injection bypasses the digestive system, allowing higher concentrations to reach the liver directly. Proponents claim this accelerates fat burning, boosts energy, and helps with weight loss. Some clinics suggest you can lose up to 4 pounds per week.
The problem is that theory and proof are two different things.
What the Evidence Actually Shows
Very limited research exists on the efficacy, safety, or lipotropic properties of these ingredients when injected for weight loss. No clinical trials have demonstrated that MIC injections cause meaningful fat loss in humans. No research has determined how much weight you can realistically lose from the shots, and no studies have examined whether any results persist after you stop getting them.
If you do lose weight while receiving slim shots, that loss is likely driven by the diet and exercise changes that clinics typically recommend alongside the injections, not the shots themselves. The injections essentially ride the coattails of a calorie deficit.
The vitamin B12 component faces similar scrutiny. The Mayo Clinic notes there’s no solid proof that B12 injections help with weight loss. Unless you’re actually deficient in B12, the shots aren’t likely to give you more energy or improve physical performance.
Slim Shots vs. GLP-1 Weight Loss Drugs
Some people searching for “slim shot” may be thinking of the newer injectable weight loss medications like semaglutide (Ozempic, Wegovy) or tirzepatide (Mounjaro, Zepbound). These are fundamentally different treatments.
GLP-1 drugs are FDA-approved prescription medications that mimic hormones your body naturally produces after eating. They work by slowing digestion, reducing appetite, and decreasing how much sugar your liver produces. People on these medications often notice appetite changes within the first few days to weeks, and clinical trials show significant, sustained weight loss over months.
Lipotropic slim shots, by contrast, are nutrient blends with no FDA approval for weight loss and no comparable clinical evidence. The price difference reflects this gap: GLP-1 medications cost significantly more but have robust research behind them, while slim shots are cheaper ($20 to $75 per session, or $80 to $300 per month for packages) but lack proven results.
Safety Considerations
Because the FDA doesn’t regulate lipotropic injections as drugs, they haven’t been formally tested for safety. Common side effects reported anecdotally include pain or redness at the injection site, mild nausea, and digestive upset. These tend to be minor.
The more serious concern is quality control. Without FDA oversight, there’s no guarantee about what’s in a given injection, how it was prepared, or whether the dosing is appropriate. The FDA has issued warnings about unapproved injectable products marketed for fat reduction, noting reports of permanent scars, serious infections, skin deformities, cysts, and deep painful knots. While that warning focused specifically on fat-dissolving injections (a different category than lipotropic shots), it underscores the risks of unregulated injectables in general.
The only injectable fat-reduction product the FDA has approved is deoxycholic acid (Kybella), and that approval is limited to reducing fat under the chin in adults. It is not the same thing as a slim shot.
What You’re Really Paying For
At $20 to $75 per injection, slim shots are relatively inexpensive compared to other weight loss interventions. Medical spas and wellness clinics tend to charge more due to overhead, while telehealth options that ship supplies to your home can be cheaper. Most clinics recommend weekly injections, putting monthly costs in the $80 to $300 range depending on the provider and package.
The ingredients in slim shots (methionine, inositol, choline, B12) are all available as oral supplements at a fraction of the cost. Whether injecting them offers any advantage over swallowing them hasn’t been established for weight loss purposes. You’re largely paying for the clinical setting, the convenience, and the psychological boost of doing something active about your weight, which isn’t worthless but isn’t the same as paying for a proven treatment.